\begin{table}%t11
\par
\caption{\label{table:parameters}Projected rotational velocity, temperature, surface gravity, mass and age of T~dwarfs.}  
%%\centerline

 {           
\begin{tabular}{l c c c c c c c c c c}     % 5 columns 
\hline\hline       
Object                    & Spectral type & $v_{\rm rot} \sin i$ & $\langle T_{\rm eff}\rangle$ & Prev. & Ref. & $\langle \log g\rangle$ & Prev. & Ref.  & $M$ & Age \\
         &          & {km~s$^{-1}$}   &   {K} &   {K} & & {(cm s$^{-2}$)} & {(cm s$^{-2}$)} & &  $M_{\rm J}$ & {Gyr} \\
\hline    
\object{SDSSp J125453.90-012247.4} & T2   & 34 $\pm$ 7  & 2007 $\pm$ 662 & 1200                & 1 & 4.3 $\pm$ 1.0 & 5.0          & 1 & -- & -- \\
\object{2MASS J05591914-1404488}   & T4.5 & 28 $\pm$ 5  & 1002 $\pm$ 278 & 1200                & 1 & 4.9 $\pm$ 0.8 & 5.5          & 1 & $30^{\rm +45}_{-23}$ & $1.0^{\rm +9}_{-0.9}$  \\[0.3mm]
\object{2MASS J15031961+2525196}   & T5   & 36 $\pm$ 5  & 1009 $\pm$ 217 & 1178                & 2 & 4.6 $\pm$ 0.8 & $\approx$5.0 & 5 & $18^{\rm +37}_{-13}$ & $0.4^{\rm +4.6}_{-0.3}$  \\[0.3mm]
\object{SDSS J162414.37+002915.6}  & T6   & 42 $\pm$ 5  &  980 $\pm$ 163 & 1002$^{\rm +98}_{86}$   & 3 & 4.8 $\pm$ 0.7 & $\approx$5.0 & 5 & $23^{\rm +52}_{-16}$ & $0.6^{\rm +9.4}_{-0.5}$  \\[0.3mm]
\object{SDSS J134646.45-003150.4}  & T6.5 & 16 $\pm$ 5  &  990 $\pm$ 107 & 960--1020            & 4 & 4.1 $\pm$ 0.4 & 5.0--5.2      & 4 & $10^{\rm +10}_{-5}$   & $0.1^{\rm +0.4}_{-0.08}$ \\[0.3mm]
\object{2MASS J15530228+1532369}   & T7   & 30 $\pm$ 7  &  941 $\pm$ 138 & 893                 & 2 & 4.6 $\pm$ 0.6 & $\approx$5.0 & 5 & $18^{\rm +30}_{-11}$  & $0.4^{\rm +3.6}_{-0.3}$  \\[0.3mm]
\object{2MASS J12171110-0311131}   & T7.5 & 29 $\pm$ 7  &  922 $\pm$ 103 & 860--880             & 4 & 4.8 $\pm$ 0.7 & 4.7--4.9      & 4 & $23^{\rm +52}_{-16}$ & $0.8^{\rm +9}_{-0.7}$  \\[0.3mm]
\object{GL 570D} 		   & T7.5 & 32 $\pm$ 8  &  948 $\pm$ 53  & 780--820             & 4 & 4.5 $\pm$ 0.5 & 5.1          & 4 & $15^{\rm +15}_{-9}$  & $0.3^{\rm +1.7}_{-0.2}$  \\[0.3mm]
\object{2MASS J04151954-0935066}   & T8   & 36 $\pm$ 7  &  947 $\pm$ 79  & 740--760             & 4 & 4.3 $\pm$ 0.7 & 4.9--5.0      & 4 & $10^{\rm +20}_{-6}$  & $0.1^{\rm +1.9}_{-0.09}$ \\ 
\hline                  
\end{tabular}}
\par
\medskip
$^1$ Cushing et~al. (\cite{Cushing08}). $^2$ Estimated $T_{\rm eff}$ derived from the $T_{\rm eff}$-spectral type relation in Looper et~al. (\cite{Looper08}). $^3$ Vrba et~al. (\cite{Vrba04}). $^4$ Burgasser et~al. (\cite{Burgasser06}a). $^5$ Knapp et~al. (\cite{Knapp04}).
\end{table}